Stratigraphic cyclicity and reservoir heterogeneity within upper San Andres and Grayburg strata (upper Permian-Guadalupian), Maljamar field, Se New Mexico /
"negative platform accommodation," and resulting in
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1997.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | "negative platform accommodation," and resulting in (interparticle to moldic) and variable degrees of (visible in gamma-ray logs) can be used to constrain accumulated above marine base level, effectively filling amalgamation-nation of sandstone cycles during times of are interpreted as eolian sand sheet (erg margin) deposits. are interpreted as the most "regressive" facies within the between sand grains, early evaporate cements, and rare boundaries resulted in locally extensive dissolution and carbonate facies are typically gradational, suggesting that carbonate facies. In the study area, contacts between cementation/dissolution of carbonate sand-shoal deposits.) collapse of upper San Andres strata. Cavernous porosity was Cores, logs, and 3D seismic data from Maljamar field (Lea County, southeast New Mexico) were examined in this study and degradation of reservoir quality. In the overlying Grayburg detailed sequence stratigraphic and lithologic correlations. dominantly eolian sediments that were deposited during high- during high-frequency base-level falls. Massive sandstones early transgressive systems tracts ("Minimum accommodation explanation for)the poorly developed cycle stacking patterns exposure events resulted in local porosity inversion fabrics, however, has complicated this picture and resulted facies (reservoir facies). In contrast, late highstand to flow units. Diagenetic overprinting of primary depositional Formation, cycles consist of mixed sandstone and shallowwater framework. Upper San Andres strata are divided into three frequency base-level falls and lowstands provides an Grayburg Formation-nation. Siliciclastic facies largely Grayburg Formation, vertical trends in the dominance of high-frequency sequences (HFSs). The "maximum flooding in extremely complex permeability distributions. Two scales intervals" of individual HFSs therefore comprise the primary intervals" of these HFSs consist of stacked and amalgamated intervals") contain cycles that are dominated by non- later plugged with massive anhydrite, resulting in the Long-term subaerial exposure events related to HFS Maljamar field: 1)Short-term (cycle-scale) subaerial massive, quartzose sandstones and underlying shallow marine meter-scale cycles which contain mostly subtidal carbonate nonmarine sandstone versus shallow-marine carbonate facies occurrence of low-angle ripple laminae, interpreted as wind- of meteoric diagenesis affected upper San Andres strata at Petrographic evidence for an eolian origin of Grayburg reduced long-term accommodation. Because sandstone facies reservoir peritidal carbonate facies. "Maximum flooding ripple laminae. The interpretation of Grayburg sandstones as sandstones along the middle Grayburg platform were deposited sandstones includes the virtual lack of textural variation that are typical of mixed sandstone-carbonate strata of the used to construct a detailed sequence stratigraphic |
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| Item Description: | "Major subject: Geology". Vita. |
| Physical Description: | x, 103 leaves : illustrations, maps ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |